#include<iostream>
#include<vector>
using namespace std;
int main() {
	int N, T;
	cin >> N >> T;
	vector<int> M(T*2);
	for (int i = 0; i < T; i++) {
		cin >> M[i * 2] >> M[i * 2 + 1];
	}
	for (int i = 0; i < T; i++) {
		if (M[i * 2] == N) {
			N = M[i * 2 + 1];
		}
		else if (M[i * 2 + 1] == N) {
			N = M[i * 2];
		}
	}
	cout << N << endl;
}